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Journal of Alloys and Compounds
Elsevier Science S.A.
Journal of Alloys and Compounds

Elsevier Science S.A.

0925-8388

Journal of Alloys and Compounds/Journal Journal of Alloys and CompoundsSCIISTPEI
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    Photoluminescence analysis of Er3+-ions Doped P2O5-Gd2O3/GdF3-BaO-ZnO glass systems

    Kothan S.Ahad A.Shoaib M.Khan I....
    8页
    查看更多>>摘要：We develop two Er3+-ions-doped Phosphate glass systems, 69 P2O5-10Gd2O3-10BaO-10ZnO-1Er2O3 and 69 P2O5-10GdF3-10BaO-10ZnO-1Er2O3, labeled as ZBaFEr and ZBaOEr, respectively, by the melt-quenching technique and study systematically their physical, optical, and luminescence properties such as densities, refractive indexes, ultraviolet-visible near-infrared (UV-Vis-NIR) absorption, photoluminescence spectra in Vis-NIR region, CIE coordinates and lifetime. The absorption spectra revealed the Er3+ peaks at 378, 405, 451, 489, 522, 652, 803, 978, and 1537 nm, attributed to the transition from 4I15/2 level to 4G11/2, 2G9/2, 4F5/2, 4F7/2, 2H11/2, 4F9/2, 4I9/2, 4I11/2 and 4I13/2 levels, respectively. We find that at 380-nm excitation, the emission peak at 1543 nm in the near-infra-red (NIR) region has a higher intensity for ZBaFEr than for the ZBaOEr. Furthermore, we employ the Judd-Ofelt (JO) and McCumber theory to study the stimulated emission cross-section for 4I13/2→4 I15/2 transitions of Er3+ ion. We find the bandwidth-quality [FWHM x σemi(λ)] to be 249 and 274 for ZBaOEr and ZBaFEr, respectively. The NIR-emission for both glasses covers the S-, C- and L-band of low-less-communication-window. The present results suggest that these glasses can be potentially used in optical amplifiers and tunable lasers.
      原文链接:
    • NSTL
    • Elsevier

    Melt solidification rate-dependent structural and thermoelectric properties of Sb2Te3/Te nanocomposites

    Meena D.K.Bose R.S.C.Ramesh K.
    10页
    查看更多>>摘要：Polycrystalline Sb2Te3/Te nanocomposites were prepared using the melt-quenching process, wherein different quenching mediums such as alkaline ice water, ice water, normal water, liquid nitrogen, and air-cooling were used. The existence of both Sb2Te3 and Te phases was revealed by various structural characterizations. The rate of melt solidification has a significant influence on the composition, microstructure, and thermoelectric transport properties of Sb2Te3/Te nanocomposites. The moderate cooling rate (normal water and liquid nitrogen cooling) of melt solidification showed a higher figure of merit (zT) value of ~0.25 at 423 K due to higher defect density. The different zT values observed for different quenching mediums and the correlation between melt solidification rate and the structural and thermoelectric transport properties were discussed in this paper.
      原文链接:
    • NSTL
    • Elsevier

    Soft X-ray absorption study of sputtered tin oxide films

    Gago R.Azpeitia J.Esteban-Mendoza D.Jimenez I....
    9页
    查看更多>>摘要：The bonding structure of tin oxide (SnOx) films grown by reactive DC magnetron sputtering has been studied by the combination of X-ray diffraction (XRD) and soft X-ray absorption near-edge structure (XANES). The oxygen incorporation in the films has been controlled by the O2 partial pressure (PO2) in the O2/Ar discharge mixture. In addition, the impact of substrate heating and post-deposition flash lamp annealing (FLA) on crystal growth has been studied. In general, it has been stablished a transition from SnO to SnO2 arrangements by increasing PO2, where XRD and XANES provide complementary results about the formation of single- and mixed-phase films. In samples produced at room temperature, XANES gives unique information about such structural evolution, as well as related to defects like the incorporation of O2 molecules at high PO2. FLA on samples grown at room temperature promotes crystal growth and the phase evolution follows the initial structural selectivity. Finally, the optical properties and surface morphology of the films have been correlated with the structural identification.
      原文链接:
    • NSTL
    • Elsevier

    Electro-deposited copper nanoclusters on leaf-shaped cobalt phosphide for boosting hydrogen evolution reaction

    Yang M.Wang Y.Gu Y.Xue Z....
    10页
    查看更多>>摘要：Exploring structural regulation of transition metal phosphides (TMPs) by incorporating suitable foreign components to increase hydrogen evolution reaction (HER) performance presents considerable development for electrocatalytic water-splitting technology. Herein, we reported an original construction strategy of thin-leaf-shaped cobalt phosphide coupled with copper nanoclusters supported on nickel foam (NF) for HER. A simple electrochemical deposition technique is used to obtain the interface-engineered Co2P@Cu nanostructure. The resultant nanocomposite with a vertically staggered structure shows the enhanced electrochemical characteristics derived from the Schottky junction at the interface between Co2P and Cu, which has a large of active sites and low charge-transfer resistance. The Schottky effect promotes charge distribution, accelerates adsorption of hydrogen intermediates, and facilitates electron transfer in the Co2P. As a result, the Co2P@Cu composite drives the current densities of 10 and 100 mA cm?2 for the alkaline HER to reach the lower overpotentials of 99.7 and 303.2 mV, respectively, and a smaller Tafel slope of 48.8 mV dec?1 compared to the bare Co2P electrocatalyst. Moreover, the proposed electrode exhibits good HER durability with almost no loss of Cu based on 2000 cycles of cyclic voltammetry sweeps and 24 h of chronoamperometry test. This work offers a perspective for the additive engineering of non-noble metals to metal phosphides toward efficient HER.
      原文链接:
    • NSTL
    • Elsevier

    Transformation of diffusive to capacitive kinetics in nanoscale modified Co-TiO2@CNTs composites safeguarding steady reversible capacity as sodium-ion battery anode

    Kalam A.Iqbal J.Qayyum M.A.Wageh S....
    10页
    查看更多>>摘要：The effective diffusion-controlled performance of the SIB anode, CoxTi1?xO2/CNTs, presented here offers high reversible sodium uptake. Kinetic studies of the samples conducted through cyclic voltammetry at various scan rates suggest that by increasing the mass ratio of Co atoms in TiO2 lattice the mechanism is shifted from a slow diffusive charge contribution to a fast capacitive charge contribution. Partial amorphization of the crystalline TiO2 diffraction planes revealed by ex-situ XRD along with the attenuation of the crystal lattice reflects the ability of the electrodes for high reversible sodium uptake. The synchronous effect of CNTs and Co loading enhance the porosity with multiple electronic/ionic conducting channels favouring high sodium storage and stability from 109.3 mAh g–1 in TiO2 to 168.5 mAh g–1 in Co0.03Ti0.97O2/CNT electrode after 80 cycles at a current rate of 0.05 C.
      原文链接:
    • NSTL
    • Elsevier

    Strengthening and toughening B4C/Al composites via optimizing the Al2O3 distribution during hot rolling

    Fan M.Shang Y.Jiang W.Zhang Y....
    15页
    查看更多>>摘要：B4C/Al composites with a high B4C content of 30 wt% were successfully fabricated by hot pressing sintering followed by hot rolling. The influence of hot rolling on the microstructure, mechanical properties, anisotropy and the interfacial conditions of the B4C/Al composites were systematically investigated. The improvement of the interfacial Al2O3 nanoparticles distribution during hot rolling increased both the strength and ductility. After sintering of B4C/Al composites, some Al2O3 nanoparticles aggregated together at the interface between B4C and Al matrix, lowering the interface bonding strength between B4C and Al matrix. The Al2O3 nanoparticles dispersed into the Al grain interior after rolling, leading to a well bonding interface between B4C particles and the Al matrix. In addition, the dispersion of Al2O3 nanoparticles into the Al grain interior contributed to the strength through Orowan strengthening and ductility through the enhancement of dislocation storage ability. The strengthening and toughening mechanisms of the composites are discussed in detail.
      原文链接:
    • NSTL
    • Elsevier

    The synergistic addition of Al, Ti, Mo and W to strengthen the equimolar CoCrFeNi high-entropy alloy via thermal-mechanical processing

    Man J.Liu Y.Wu B.Duan G....
    14页
    查看更多>>摘要：The tensile mechanical properties and microstructures of the (CoCrFeNi)(100?x)(WMo)x and (CoCrFeNi)(100?x?6)(WMo)x(Al Ti)6 (x = 1, 3, and 5) HEAs were investigated in the present work. The results showed that in addition to solid solution strengthening, grain boundary strengthening and dislocation strengthening, the equimolar CoCrFeNi-HEA doped with W and Mo was effectively strengthened by the precipitation of submicron topological close-packed phase (TCP) σ via thermal-mechanical processing. When Al (3 at%) and Ti (3 at%) added based on W and Mo additions, the alloys were further strengthened due to the formation of a heterogeneous microstructure containing the submicron σ phase, nano γ′ phase and micron (Ti, W, Mo)-rich phase. Tensile yield and ultimate strengths of the thermal-mechanical processed (CoCrFeNi)91(WMo)3(AlTi)6 and (CoCrFeNi)93(WMo)1(AlTi)6 HEAs can reach to 1576 MPa and 1216 MPa, respectively, combined with the correspondent elongations of 4.0% and 10.7%, respectively. The synergistic addition of W, Mo, Al and Ti is effective for improving the mechanical property of the equimolar CoCrFeNi-HEA. Ti easily causes the formation of (Ti, W, Mo)-rich phase that plays a role in enhancing the alloy.
      原文链接:
    • NSTL
    • Elsevier

    Tunable ultraviolet-B full-spectrum delayed luminescence of bismuth-activated phosphors for high-secure data encryption and decryption

    Wang C.Jin Y.Zhang R.Yuan L....
    8页
    查看更多>>摘要：The ultraviolet-B (UVB) delayed luminescence materials, holding great potential in the field of phototherapy, sterilization, photocatalysis and anti-counterfeiting, however, lack of spectral tunability study and restricted to limited persistent time. In this paper, a series of Bi3+-doped garnet phosphors were successfully synthesized and the Bi3+ emission is for the first time tuned controllably and finely within UVB full-spectrum. The continuous replacement of Ga3+ by Al3+ ions gives rise to a fine blue-shift of Bi3+ emission from 313 to 302 nm due to the greater covalency of the Ga[sbnd]O bond. Driven by the increased symmetry of the dodecahedron, it is further shifted to a much shorter wavelength step-by-step and finally approached to 298 nm with the progressive substitution of Y3+ by Lu3+ ions. The developed Bi3+-doped phosphors show delayed UVB luminescence, of which the persistent time can be optimized to more than 72 h by the effective combination of bandgap engineering and trap engineering strategies. Moreover, excellent optically stimulated luminescence that the UVB persistent luminescence of the pre-irradiated phosphor can be repeatedly revitalized by a low-energy 870 nm near-infrared (NIR) LED light source. As a proof-of-concept, invisible characters of UV write-in and NIR read-out for high-secure data encryption and decryption application using 8-bit ASCII binary codes were implemented. This work not only offers the path for the development of novel UVB phosphors with desired emission wavelength but also extends the applications of UVB delayed luminescence materials.
      原文链接:
    • NSTL

    Orientation dependence of polarization-modulated photovoltaic effect of relaxor-based Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 single crystals

    Cai Y.Meng Q.Yang C.Qi X....
    8页
    查看更多>>摘要：Noncentrosymmetry ferroelectric materials coupled with switchable polarization are promising candidates for photovoltaic applications because of their unique dissociation mechanism of photogenerated excitons associated with bulk polarization. Here, we study the photovoltaic properties of relaxor-based 24Pb(In1/2Nb1/2)O3–47Pb(Mg1/3Nb2/3)O3–29PbTiO3 (24PIN–47PMN–29PT) single crystals with a large remnant polarization and a proper optical bandgap along various crystallographic orientations. The 24PIN–47PMN–29PT single crystals are found to exhibit a modulated photovoltaic response by switching the poling direction, while their current–voltage curves present a linear relation. The superior photovoltaic response in the [111]C‐oriented crystal suggests that the photovoltage is strongly dependent on the crystallographic direction because of the polarization intensity difference. In addition, the domain configuration, phase structure, ferroelectric performance, and optical characteristics of 24PIN–47PMN–29PT single crystals are investigated, providing clues to the origin of the anomalous photovoltaic effect of these single crystals. Our results indicate that the photovoltaic performance of 24PIN–47PMN–29PT single crystals can expand their potential applications in photovoltaic devices, photorefraction, and photorefractive optical applications.
      原文链接:
    • NSTL
    • Elsevier

    Enhanced UV photosensing properties by field-induced polarization in ZnO-modified (Bi0.93Gd0.07)FeO3 ceramics

    Tu C.-S.Chen C.-S.Haw S.-C.Wang J.-P....
    12页
    查看更多>>摘要：Self-powered photodetection was studied using x wt% ZnO-modified (Bi0.93Gd0.07)FeO3 (abbreviated as B7GFO-xZn) ferroelectric ceramics. The ITO/B7GFO-xZn ceramic/Au photovoltaic (PV) cell was constructed for photosensing study at ultraviolet-A (λ = 360 nm) and near-ultraviolet (λ = 405 nm). The +2kV/cm poled PV cell using B7GFO-1 wt%Zn ceramic under 360-nm irradiation displays maximal photocurrent density of ~364 μA/cm2 at 102 mW/cm2. Furthermore, a remarkable photosensing performance was observed with photoresponsivity (R) of ~3.02×10?2A/W, specific detectivity (D*) of ~2.27×1012 Jones, and photoconductive gain (G) of ~10.4%. A sensitive photosensing response time (rise time, τr) of ~9 ms was acquired under illumination from the 360-nm laser at 102 mW/cm2. The enhanced photodetection performance originated from the collective influence of the narrower bandgap, enhanced p-n junction effect, E-field-modulated energy band tilt, and improved photocurrent generation due to the local conductive pathways formed by the interconnected domain walls and grain boundaries. This work provides an extensive analysis to elucidate the photovoltaic mechanisms in BiFeO3-based ceramics and explores their potential in self-powered UV photosensing.
      原文链接:
    • NSTL
    • Elsevier